Abandoned railway line circling the city of Paris.

Notorious artist squat renovated into legal studios.

A bizarre house filled with an astounding array of collections.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Try not to get slimed in Tribeca.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Dramatic river bend surrounds a natural red-rocked pedestal.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

An emerald-green grotto just a short trip from Austin.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The world's only museum devoted to the wonders of fluorescence.

An exquisite tunnel of cascading flowers.

France's most famous cemetery, with some of its most curious tombs.

These fantastically named natural pools look like something out of a Scottish myth.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.